Lo'ak te Suli Tsyeyk’itan is the son of Jake Sully and Neytiri, the younger brother of Neteyam, the older brother of his only biological youngest sister, Tuktirey, and the younger adoptive brother of Kiri.[2]

When the RDA returned to Pandora, Lo'ak wanted to fight alongside his parents but they dismissed the idea. When they were attacked by Miles Quaritch and the Recombinants, Lo'ak and his family fled to the Metkayina clan. He learned their ways, forming a close bond with a tulkun named Payakan and You, daughter of the clan's leaders.